Certified Phlebotomy Technician Exam Anatomy and Physiology 3

Question 1

When antecubital veins are inaccessible, which alternative venipuncture site is commonly used?

Accepted Answer

Dorsal hand veins

Answer

Dorsal hand veins are an acceptable alternative venipuncture site when antecubital veins cannot be accessed, though they are smaller and more sensitive, requiring a smaller gauge needle.

Question 2

In the cardiac cycle, what does the QRS complex on an ECG represent?

Accepted Answer

Ventricular depolarization

Answer

The QRS complex represents ventricular depolarization — the electrical event that triggers contraction of both ventricles to eject blood into the pulmonary and systemic circulations.

Question 3

Which description best defines the function and structure of capillaries?

Accepted Answer

Microscopic, single-cell-thick vessels where gas and nutrient exchange occurs between blood and tissues

Answer

Capillaries are the smallest blood vessels, with walls only one endothelial cell thick, allowing efficient diffusion of oxygen, carbon dioxide, nutrients, and waste products between blood and surrounding tissues.

Question 4

What is the primary oxygen-carrying protein found within red blood cells?

Accepted Answer

Hemoglobin

Answer

Hemoglobin is the iron-containing protein in red blood cells that binds oxygen in the lungs, transports it through the bloodstream, and releases it to oxygen-deprived tissues.

Question 5

What is one primary function of the lymphatic vessels in relation to the circulatory system?

Accepted Answer

Returning excess interstitial fluid to the bloodstream

Answer

Lymphatic vessels collect excess fluid (lymph) that has leaked from capillaries into interstitial spaces and return it to the venous circulation, maintaining fluid balance and supporting immune function.

Certified Phlebotomy Technician Exam Practice Test

Certified Phlebotomy Technician Exam Practice Test

Certified Phlebotomy Technician Exam Anatomy and Physiology 3